CVE-2019-18336

A vulnerability has been identified in SIMATIC S7-300 CPU family (incl. related ET200 CPUs and SIPLUS variants) (All versions < V3.X.17), SIMATIC TDC CP51M1 (All versions < V1.1.8), SIMATIC TDC CPU555 (All versions < V1.1.1), SINUMERIK 840D sl (All versions < V4.8.6), SINUMERIK 840D sl (All versions < V4.94). Specially crafted packets sent to port 102/tcp (Profinet) could cause the affected device to go into defect mode. A restart is required in order to recover the system. Successful exploitation requires an attacker to have network access to port 102/tcp, with no authentication. No user interation is required. At the time of advisory publication no public exploitation of this security vulnerability was known.

Published: 2020-03-10 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2019-18336 is rated Moderate Risk (57.2/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.67%). EPSS rose +1.42% over the last day, indicating growing attacker interest. Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2019-18336

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.25% 1.67% +1.42%
2 2025-11-21 0.17% 0.25% +0.08%
3 2025-11-18 — 0.17% —

Full EPSS history (12 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2019-18336

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 134c704f-9b21-4f2e-91b3-4a467353bcc0
7.8 2.0 HIGH
AV:N/AC:L/Au:N/C:N/I:N/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:C)
Complete availability impact.
 10.0 6.9 [email protected]

Weakness enumeration for CVE-2019-18336

GitHub Security Advisory for CVE-2019-18336

GHSA-q53p-vg4g-3rxp · Severity: high — A vulnerability has been identified in SIMATIC S7-300 CPU family (incl. related ET200 CPUs and...

Affected software / configurations for CVE-2019-18336

Vendor Product Version Raw CPE
siemens simatic_s7-300_cpu_firmware < 3.3.17 cpe:2.3:o:siemens:simatic_s7-300_cpu_firmware:*:*:*:*:*:*:*:*
siemens simatic_s7-300_cpu_312_ifm_firmware < 3.3.17 cpe:2.3:o:siemens:simatic_s7-300_cpu_312_ifm_firmware:*:*:*:*:*:*:*:*
siemens simatic_s7-300_cpu_313_firmware < 3.3.17 cpe:2.3:o:siemens:simatic_s7-300_cpu_313_firmware:*:*:*:*:*:*:*:*
siemens simatic_s7-300_cpu_314_firmware < 3.3.17 cpe:2.3:o:siemens:simatic_s7-300_cpu_314_firmware:*:*:*:*:*:*:*:*
siemens simatic_s7-300_cpu_314_ifm_firmware < 3.3.17 cpe:2.3:o:siemens:simatic_s7-300_cpu_314_ifm_firmware:*:*:*:*:*:*:*:*
siemens simatic_s7-300_cpu_315_firmware < 3.3.17 cpe:2.3:o:siemens:simatic_s7-300_cpu_315_firmware:*:*:*:*:*:*:*:*
siemens simatic_s7-300_cpu_315-2_dp_firmware < 3.3.17 cpe:2.3:o:siemens:simatic_s7-300_cpu_315-2_dp_firmware:*:*:*:*:*:*:*:*
siemens simatic_s7-300_cpu_316-2_dp_firmware < 3.3.17 cpe:2.3:o:siemens:simatic_s7-300_cpu_316-2_dp_firmware:*:*:*:*:*:*:*:*
siemens simatic_s7-300_cpu_318-2_firmware < 3.3.17 cpe:2.3:o:siemens:simatic_s7-300_cpu_318-2_firmware:*:*:*:*:*:*:*:*
siemens sinumerik_840d_sl < 4.8.6 cpe:2.3:a:siemens:sinumerik_840d_sl:*:*:*:*:*:*:*:*
siemens sinumerik_840d_sl < 4.94 cpe:2.3:a:siemens:sinumerik_840d_sl:*:*:*:*:*:*:*:*
siemens simatic_tdc_cp51m1_firmware < 1.1.8 cpe:2.3:o:siemens:simatic_tdc_cp51m1_firmware:*:*:*:*:*:*:*:*
siemens simatic_tdc_cpu555_firmware < 1.1.1 cpe:2.3:o:siemens:simatic_tdc_cpu555_firmware:*:*:*:*:*:*:*:*

References for CVE-2019-18336

cvelogic Threat Intelligence